The shaft also shall have a directional indicator on top to indicate disc position when the handle is removed.

阀杆也应该在顶部配置方向指示器，用于当手柄拆卸下来时指示阀瓣的位置。

youdao

The shaft also shall have a directional indicator on top to indicate disc position when the handle is removed.

阀杆也应该在顶部配置方向指示器，用于当手柄拆卸下来时指示阀瓣的位置。

youdao